淡薄表层 meaning in English

ochric epipedon

Many entisols have an ochric epipedon and a few have an anthropic epipedon
许多新成土有一层淡薄表层，有些则有一层人为扰动层。
2 . the diagnostic surface horizons divided on the soils of the area are mollic epipedon , umbric epipedon and ochric epipedon . the diagnostic subsurface horizons are cambic horizon , argic horizon , histic evidence and mattic evidence . the diagnostic characteristics are sapric soil materials , folic soil materials , soil moisture regimes , soil temperature regimes , ferric property and base saturation
本地区土壤划分出的诊断表层有暗沃表层、暗瘠表层和淡薄表层，诊断表下层有雏形层、粘化层，诊断现象有有机现象、草毡现象，诊断特性有6个：高腐有机土壤物质、落叶有机土壤物质、土壤水分状况、土壤温度状况、铁质特性、盐基饱和度。